A Sixteen-Millimeter Portable Sound-on-Film Projection Equipment
C. R. Hanna, P. L. Irwin, E. W. Reynolds · Journal of the Society of Motion Picture Engineers · 1933
A portable sound-on-film projection equipment using 16-mm. film is described. The film is standard with the exception that one row of sprocket holes is omitted to provide space for the sound track. The projector is only slightly larger than the average silent picture projector. A detailed description of its mechanical, electrical, and optical features is given. — The complete equipment is mounted in three carrying cases, one for the projector, one for the amplifier, and one for the loud speaker and screen. The projector case serves also as a sound-proof housing when the equipment is in operation. The rewind, splicer, cables, spare tubes and lamps, and the films are located in the case for the loud speaker and screen. Each of the carrying cases weighs approximately 40 pounds, making the total weight of the equipment 120 pounds.